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Investments in Unconsolidated Joint Ventures (Balance Sheets of the Unconsolidated Joint Ventures) (Details) (USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2014
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Dec. 31, 2013
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| Schedule of Equity Method Investments [Line Items] | ||||||
| Real estate and development in process, net | $ 15,886,276 | $ 15,817,194 | ||||
| Mortgage and notes payable | 4,328,464 | 4,449,734 | ||||
| Other liabilities | 517,428 | 578,969 | ||||
| Total liabilities and equity | 18,875,160 | 20,162,251 | ||||
| Carrying value of the Company's investments in unconsolidated joint ventures | 180,149 | 126,084 | ||||
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Unconsolidated Joint Ventures [Member]
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| Schedule of Equity Method Investments [Line Items] | ||||||
| Real estate and development in process, net | 1,014,663 | 924,297 | ||||
| Other assets | 182,905 | 163,149 | ||||
| Total assets | 1,197,568 | 1,087,446 | ||||
| Mortgage and notes payable | 753,692 | 749,732 | ||||
| Other liabilities | 23,180 | 28,830 | ||||
| Members'/Partners' equity | 420,696 | 308,884 | ||||
| Total liabilities and equity | 1,197,568 | 1,087,446 | ||||
| Company's share of equity | 208,125 | 154,726 | ||||
| Basis differentials | (27,976) | [1] | (28,642) | [1] | ||
| Carrying value of the Company's investments in unconsolidated joint ventures | $ 180,149 | $ 126,084 | ||||
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